What is it about?

Carbon dioxide (CO2) dissolved in groundwater and CO2 flux from soils are key parameters for volcano monitoring purposes. We have shown a direct connection in space between the larger CO2 partial pressure dissolved in groundwater and the Diffuse Degassing Structures (DDS) at Vulcano (Aeolian Islands - Italy). While isotope composition of dissolved CO2 and partial pressure of dissolved CO2 have been computed through an equilibrium model applied to the total dissolved inorganic carbon, isotope composition of CO2 from soils has been measured in the field.

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Why is it important?

The connection between the sources of CO2 dissolved in groundwater and CO2 discharged from soils has been investigated to identify processes which can modify the amount and the isotopic composition of CO2 flowing through volcanic rocks above the aquifers. Our findings allow to better identify the CO2 sources for partitioning purposes of CO2 emissions from soils between organic and hydro-thermal ones.

Perspectives

Measurement collection and data processing have been very addicting. It was very intriguing to find a perfect spatial correspondence between hydrothermal gas sources in groundwater and diffuse degassing structure at the surface. As part of a very-close co-authors team, it was was a great pleasure writing this article.

Dr Roberto M. R. Di Martino
Istituto Nazionale di Geofisica e Vulcanologia

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This page is a summary of: Dissolved Carbon in Groundwater versus Gas Emissions from the Soil: The Two Sides of the Same Coin, Procedia Earth and Planetary Science, January 2017, Elsevier,
DOI: 10.1016/j.proeps.2016.12.021.
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